Your truck's cooling system works nonstop to keep engine temperature in a safe range, whether you're idling in city traffic or running long-haul miles on I-65. When a hose cracks, a seam corrodes, or coolant starts disappearing, the result is the same — rising heat that can damage your engine fast. Paul's Repair Shop provides truck radiator repair for diesel trucks and fleet vehicles throughout Marion County, starting every job with a pressure test and visual inspection to confirm exactly what's causing the problem before any part is touched.
Whether you need a routine flush, a same-day fix for a truck leaking coolant, or a full semi truck radiator repair after a cracked core, our ASE Certified mechanics use the latest diagnostic tools to give you an honest answer and a written estimate before any work begins. Paul's Repair Shop backs every truck coolant repair with a 12-month warranty and a 100% satisfaction guarantee, so Indianapolis drivers can get back on the road with confidence instead of guessing at the bill.
Repair cost for your truck's radiator and cooling system depends on the issue (a flush vs. a leak vs. full replacement), whether the truck is a passenger pickup or a heavy-duty commercial diesel, and how extensive the damage is. The table below reflects typical national pricing ranges, including semi truck radiator repair cost specifically.
| Service / Part | Price Range | Service / Part | Price Range |
|---|---|---|---|
| Radiator Flush & Fill (passenger truck) | $100 – $250 | Radiator Flush & Fill (heavy-duty / commercial) | $200 – $400 |
| Coolant Leak Repair (hose, gasket, or seal) | $250 – $750 | Radiator Replacement (light-duty truck) | $750 – $1,850 |
| Semi Truck Radiator Replacement (heavy-duty) | $1,350 – $3,500 | Water Pump Replacement (diesel / commercial) | $800 – $1,500 |
| Thermostat Replacement | $200 – $600 | Pressure Test / Diagnostic Inspection | $500 – $150 |
📊 DATA SOURCE: Pricing ranges compiled from RepairPal Fair Price Estimator, ConsumerAffairs, and Kelley Blue Book.
As a general rule, a coolant leak caught early is almost always cheaper to repair than the overheating damage it can cause if ignored — a $250 hose repair today can prevent a $3,000+ engine repair if a truck keeps running hot. Radiator and cooling system repair on heavy-duty trucks (Freightliner, Kenworth, Volvo, Mack) generally falls toward the higher end of these ranges due to larger cooling systems and longer labor time. Paul's Repair Shop in Indianapolis, IN provides a free, written estimate before any work begins so there are no surprises on the final bill.
If you notice any of these symptoms, don't wait for a scheduled mileage interval — driving a truck that's overheating risks warped cylinder heads or a blown head gasket, turning a routine truck coolant repair into a major engine repair. Schedule a pressure-test inspection at Paul's Repair Shop in Indianapolis, IN before a warning sign turns into a roadside breakdown.
| Status | Warning Sign | What It Means for Your Indianapolis Truck |
|---|---|---|
| ⚠️ | Temperature Gauge Climbing Toward Red | The clearest sign of a cooling system problem — pull over and shut off the engine before it causes lasting damage. |
| ⚠️ | Sweet Smell in the Cab or Steam From the Hood | Often points to a coolant leak reaching the heater core or escaping as the system overheats. |
| ⚠️ | Colored Puddle Under the Truck | Orange, green, or pink fluid under the vehicle is a textbook sign of a truck leaking coolant from a hose, seam, or gasket. |
| ⚠️ | Frequent Need to Top Off Coolant | A system that keeps losing coolant has a leak somewhere, even if you can't see a puddle underneath. |
| ⚠️ | White Exhaust Smoke | Can indicate coolant entering the combustion chamber through a failing head gasket — a sign the issue has gone beyond the radiator. |
| ⚠️ | Rusty or Sludgy Coolant | Discolored coolant signals internal corrosion that reduces cooling efficiency and accelerates water pump wear. |
Our truck coolant repair process covers every part of the cooling system, from the radiator core to the smallest hose clamp — every job starts with a diagnostic inspection and ends with a pressure-test confirmation before your truck leaves the shop.
| Service Included | What We Do | Avg. Time |
|---|---|---|
| Radiator Flush & Fill | Removes old, contaminated coolant and built-up scale, then refills the system with the correct coolant blend to restore proper heat transfer. | 30–60 min |
| Coolant Leak Repair | Pressure-tests the entire cooling system to find the exact source of a truck leaking coolant, then repairs or replaces the damaged hose, gasket, or radiator seam. | 1–2 hours |
| Radiator Replacement | Removal of a cracked, corroded, or unrepairable radiator and installation of a new unit matched to your truck's cooling capacity. | 2–4 hours |
| Water Pump Replacement | Replacement of a failing water pump that can no longer circulate coolant fast enough to keep engine temperature stable. | 2–5 hours |
| Thermostat Service | Testing and replacement of a stuck or failing thermostat — one of the most common causes of semi truck overheating — to restore proper coolant flow. | 30–60 min |
| Pressure Test & Diagnostic Inspection | Hands-on pressure test and visual inspection to confirm exactly what's causing a coolant leak or overheating issue before recommending a repair. | ---- |
| Free Truck Radiator & Cooling System Price Quote | Upfront, written estimate covering radiator repair cost before any work begins — no surprises on the final bill. | ---- |
Removes old, contaminated coolant and built-up scale, then refills the system with the correct coolant blend to restore proper heat transfer.
Pressure-tests the entire cooling system to find the exact source of a truck leaking coolant, then repairs or replaces the damaged hose, gasket, or radiator seam.
Removal of a cracked, corroded, or unrepairable radiator and installation of a new unit matched to your truck's cooling capacity.
Replacement of a failing water pump that can no longer circulate coolant fast enough to keep engine temperature stable.
Testing and replacement of a stuck or failing thermostat — one of the most common causes of semi truck overheating — to restore proper coolant flow.
Hands-on pressure test and visual inspection to confirm exactly what's causing a coolant leak or overheating issue before recommending a repair.
Upfront, written estimate covering radiator repair cost before any work begins — no surprises on the final bill.
Paul's Repair Shop is Indianapolis's trusted source for truck radiator repair — serving commercial truck drivers, owner-operators, and fleet operators throughout Marion County with honest diagnostics, ASE Certified expertise, and transparent repair cost quotes. Whether you need a routine flush, a repair for a truck leaking coolant, or emergency truck coolant repairs on the road, our Indianapolis diesel mechanics are ready to help. Request a free estimate online or call (317) 292-8500.
